Improvement in cehtrifugal pujtffs



WILLIAM-Daarna ANDREWS, or Vnew Youn, N. r.

Letters Patent No. 100,838, dated March 15, 187.0.

' IMPRQVEMENT 11s CENTRIFUGAL PUMPS.

-T he Schedule referred to in these lieti-.exs Patent` and making partof the saine.

To all whom -it may concern:

Be it known that I, WILLIAM DnAifn-n ANDREWS, of the city, county, andState of New York, have invented anew and useful Improvement inCentrifugal Pumps, of which thefollowiug is a full, clear, 'and exactdescription, reference being had to the accompanying drawingforming'part of i this specification, andin which- Figure 1 represents asectional view, ftaken indirectron of the operating-shaft, cfacentrifugal pump, con- Y structed in accordance with rny improvement;4

Figure'2, a face view ofthe interioriofsaid pump,

with the induction-case removed; and

Figure 3, aside view of the propelling-wheel or revolving vane-carriertosaid pump.

A Figure 4 is 'a similar View to'ig. 1, under a slightly modiiiedconstruction of the working parts yof thepump.

Similar letters of refereneef indicate correspomliug This inventionhasfreferenee to pumps whichl operi' atingby centrifugal action, aremade up, for the most part, ot a propelling wheel, disk,or vane-carrier,ar-

ranged'to rotate within ajsuitablesbell or chamber, and operating,'in-'connection with passages of -a spiral -1 v character', t'o director divert thel course of the current'.

In the pump or pumps of this character, aspreviously patented to me, inwhich the .vanes,tl.rat in-rotating produce the suction and `expulsionof the Huid oriluidmass, are arranged only upon the suction ,side orface of their carrying disk or cone,'there is a force-or pressure equalto the head ofthe uid above or at the back, and atmospheric pressureiuducedby the vacuum ore-l ated on the suction side or face of thevane-carrier, thrown upon 'the back of said carrier, which necessitetesa step-bearing on tiresuction side or face of the latter, and whichpressures produce much friction and wear, also impair the .effectivenessof the vanes, and,

. by reason of the step-bearing referred to, exclude them from beingextended to the center' of the carrier. `These defect, heretofore, Ihave only been ablein a measure to remedygby giving to the vanes anoutward extension, beyond o r in rear of'their carrier, and in closeproximity to the stationary eduction-ease or chamber', so that thecarrier is somewhat, relieved by the action of the rearv protrudingportions of the varies from iiuid pressure at its back, and a partialvacuum.

created on such part or surface. The relief, however, thus, affordeddocs not dispense with a step-bearing on the suction side or face of thecarrier, and the vanes are restricted to an outer travel around saidbearing, which latter often forms a serious obstruction to the passageof the fluid, especially when mixed with foreign substances, such aspartially-pulped paper-stock,

' mud, and sand, mixed with shells, roots, 83o., tannin and othersubstances;r likewise said step adds to the labor of working the pump,by rendering it necessary A to rotate the fluid at a considerabledistance from the 4center of the revolving carrier, thereby causing muchpower' to be consumed in abruptly giving totheluid lthe high velocitydue to au outer initial, as contradistinguished from a central initialaction of the-'vanas These several objections are removed by thisinvention, power largely econornized, and the-construction ofthe pumpsimplilied and clreaperred, as well as its durability enlarged. To thisend The invention consists in such a construction of the working partsofthe pump as' that, while the vanes are or may be restricted to thesuction side 0r face of their revolvingvcarrier, a step-bearing on suchside or face may be dispensed with; also, the vanes be arranged tomeetic the center' of the carrier, and the latter balanced or supportedbyireason of a vacuum established on the back of saidcarrier by orthrough the action'ot' the vanos, as arranged on the ii'ont of it. JAlso, tire invention incirrdes, incombination with such or othersuitable vane-carrier, a peculiar construction orl arrangement of theeduction passages tor easing the discharge, auddirecting its course toanoutlet, which is concentric with the carrier, and from which it may beled .in any desired line or course.

Referring,- in the first instance, to figa-1, 2 and 3 of theaccompanying drawing.- 4

A is the induction,-and.B theeduction-case,secured or bolted together,and forming the outer shell of the pump.

The eduction-case B has' an inner case or shell, (l, l

castwith and connected to it by spiral -wings,d, of which 'there' inaybe any suitable number, and which are of an increasing pitclras theyapproach the delivery, and the shells Band O so shaped as to change thecourse of the current from a tangential .or'rotary one toa'straight'one, occupying a concentric relationship to the' carrier, andat right angles to Atheplane of motion ci' the carrier, the fluid, onentering the eductiomcase, being received from the carrier-vanas nearlyin line of their motion.. i

center, iu which the driving-shaft D revolves.

' flo a fiange, c, surrounding the central outlet or eduction-passage ofthe case B, may be secured a discharge- `bend or elbow, provided with astuffing-box concentric with the oarricnand through which theoperatingshaft'D, having a driving-pulley upon it, may be made to passinto or through an outer bearing, d, on a standard, E, which isattachedtc or forms part of the bedplate F. A. delivery elbow,thus-arranged, may -be turned to discharge in any dir'ection at rightangles to the driving-shaft, or thereabouts, from a straight dclivery atthe center of the pump, and in the axial line of lits driving-shaft.

r.I his inner shell Ollas a long bearing, '11, through its ferm, may .beattached.

D, and having on its front face anysuitable numberof within the case A,and between it and the inner shel rier, in close proximity to the frontorfxee edge of the .extending so asl toenter, in a close manner, withoutflange!l allows of the adjustment of the carrier G in vthrough which butlittle water o'riinid can pass from 4 several times greater than that'ofthe space estab- C, or it may be obtained by passages formed in theThe-induction-ease A is provided with a central inlet, e,to which'asuction-pipe, of anydesired length or vGf is the revolving vane-carrier,secured to the shaft wings or vanes,'ff, arranged towel-k closely, butfreely 0, but not necessarily extending beyond the latter, thoughprojecting vbeyond the pe'riphery of said carinner shell C.

The carrier G- is formed, at or near its periphery, on its back edge orface, with a projecting annular flange, g, arranged to lie parallel with.the driving-shaft, and

rubbing against oltuchling, thel interior of the shell C, or recessformed in the mouth of the same. This the axial direction of itsdriving-shaft, w-ithout establishing an objectionable opening or spacebetween said carrier andthe innerl shell, and the samev forming anangular passage 'between the carrier and vsaid shell,

the-induction-case A.

Through the carrier G, as near to thel center thereof asthey canconveniently be placed,are what may be termed vacuum passages, h h,through and by means of which the wings or vanes j' f of the revolvingcarrier, create and maintain a vacuum within the inner shell O, or uponthe back oi' the carrier G, equal to that, or thereabouts, upon thefront side or face of the latter.

These passages h h should have a combined area lished by the open orfree jointV of the outer portion or periphery of the carrier with thelmouth or interior of the inner shell C.

By this passage connection of the induction chamberA with the interiorof the shell C, or s pace at back of the carrier G, the latter isbalanced, as it were, by or through the action of the vanes f f, asarranged on front of it, relieving the back -as well as the fiont of thecarrier alike of atmospheric and water or fluid pressure. The sameresult may be obtained, and in a like manner, by means of 'a tube, vasshown byvdotted lines in lig. 1, arranged on the outside of the pump,and made to connect the induction-chamber or its inlet with the back ofthe carrier or interior of the shell walls of' theinduction-case A andinner shell O, and connecting with each other to produce a like actionor eect. Insnch ease or cases the'passages h hmay be dispensed with.

space on back of the carrier, does 4away with the ne,

cessity of a step-bearing to the front ofthe car1ier,or

lany protrusion of its driving-shaft through it, and allows of the wingsor vanes f f being extended to meet in the center oi' the carrier,whereby the several ohjeetions hereinbefore named, as incidental toprevious arrangements, are obviated.

The combination with the vanes f f of the spirallyvarrangededuction-passagcs, as established bythe wingsv -a and shells B a'nd O,whereby the course of the cur- 'rent is gradually changed, ashereinbefore described,

from a tangential and rotary one to a straight and ax` -ial one at theoutletc of the case B, insnresa speedy l relief to and free action forsaid carrrier, and gives a' compactness of character to the pump. Theshell or inner body portion O of the pumpneed not necessarily be hollow,but it is preferred to construct it so. v

While infigs. 1, 2, and 3 the carrier G is shown as of conical form onits face, and the induction-case and propelling-vanes shaped tocorrespond, in iig. 4 of the drawing said carrier is represented as ofdisk or iiat form, and the inductioncaseLor vanes shaped or arranged tocorrespond; but the principle of action is the same, and a similarpassage-like connection established through the carrier or between theinduction-case and hack ofthe carrier, to keep up a vacuum in rear of'the latter. Various shapes or configurations may, in fact,

be given tothe vane-carrier, also' tothe eduction passages or courses,as regards final delivery of the duid from the pump, without depart-ingfrom the distinguishing principal feature of this invention,

What is here claimed, and desired to be secured by Letters Patent, is-

1. The combination with the propelling-wheel, having the vanes arrangedon the face ci it, of a vacuum passage o'r passages, arranged toestablish communication between the induction side of the pump and theback of said wheel or vane-carrier, substantially as and for the purposeor purposes herein set forth.

2. The vanes, arranged to extend to the center of the propelling-wheel,in combination with a vacuum passage or passages between the inductionside of the 'pump and back of said wheel, essentially as described.

3. The arrangement, relatively to the propelling-- wheel, of the spiraleduction passages to the pump, substantially asfshownand described.

Witnesses: WM. D. ANDREWS.

Fano. HAYNEs, HENRY PALMER.

